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Concrete block masonry which is also referred to as concrete masonry unit (CMU) have advantages over brick and stone masonry.




Concrete blocks are manufactured in required shape and sizes that could possibly be solid or hollow blocks.

The most popular size concrete blocks is 39cm x 19cm x (30cm or 20 cm or 10cm) or 2 inch, 4 inch, 6 inch, 8 inch, 10 ” and 12-inch unit configurations.

Cement, aggregate, water is used to prepare concrete blocks.

The cement-aggregate ratio in concrete blocks is 1:6. Aggregate used is of 60% fine aggregate and 40% coarse aggregate.

Their Minimum strength is around 3N/mm2. ASTM C-90-91 specifies the compressive strength requirements of concrete masonry units.

Kinds of Concrete Blocks or Concrete Masonry Units

Based on the dwelling, shape, size and manufacturing processes concrete blocks are mainly classified into 2 types and they’re:

Solid concrete blocks
Hollow concrete Blocks


Solid Concrete Blocks

Solid concrete blocks can be used, that happen to be heavy in weight and made of dense aggregate. They may be very strong and provides good stability for the structures. So for giant work of masonry like for load bearing walls these solid blocks are preferable. They are available in large sizes in comparison with bricks. So, it takes much less time to construct concrete masonry than brick masonry.


Hollow Concrete Blocks

Hollow concrete blocks contains void area in excess of 25% of gross area. Solid division of hollow bricks must be greater than 50%. The hollow part may be separated into several components depending on our requirement. They are constructed from lightweight aggregates. They are light-weight blocks and easy to setup.

Forms of Hollow Concrete Blocks:

Stretcher block
Corner block
Pillar block
Jamb block
Partition block
Lintel block
Frogged brick block
Bullnose block

Concrete Stretcher Blocks
Corner blocks are used in the ends or corners of masonry. The ends could be door or window openings etc. these are arranged in a manner that their plane end visible to the outside and other end is locked using the stretcher block.

Concrete Corner Blocks
Corner blocks are utilized in the ends or corners of masonry. The ends could be door or window openings etc. they may be arranged in a way that their plane end visible external and other end is locked with the stretcher block.

Concrete Pillar Blocks
Pillar block is also called as double corner block. Generally they’re used when two ends of the corner are visible. In the case of piers or pillars these blocks are trusted.

Jamb Concrete Blocks
Jamb blocks are employed when there is an elaborated window opening from the wall. They are attached to stretcher and corner blocks. For the provision of double hung windows, jamb blocks are extremely necessary to provide space for that casing individuals window.

Partition Concrete Block
Partition concrete blocks are generally utilized to build partition walls. Partition blocks have larger height than its breadth. Hollow part is split into two to three components in the case of partition blocks.

Lintel Blocks
Lintel block or beam block is used when it comes to provision of beam or lintel beam. Lintel beam is mostly provided in the top part of windows and doors, which bears the burden via top. Concrete lintel blocks have deep groove over the duration of block as shown in figure. After placing the blocks, this groove is full of concrete in addition to reinforcement.

Frogged Brick Blocks
Frogged brick block posesses a frog on its top as well as header and stretcher like frogged brick. This frog will helps the block to carry mortar and to enjoy the strong bond with top laying block.

Bullnose Concrete Block
Bullnose blocks resemble corner blocks. Their duties also same however when we would like rounded edges at corner bullnose bricks are preferred.


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